﻿using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace LongSCADA_WPF.Helpers
{
    public static class DataSetHelper
    {
        public static DataSet ConvertToDataSet<T>(this IList<T> list)
        {
            if (list == null || list.Count <= 0)
            {
                return null;
            }
            DataSet ds = new DataSet();
            DataTable dt = new DataTable(typeof(T).Name);
            DataColumn column;
            DataRow row;
            System.Reflection.PropertyInfo[] myPropertyInfo = typeof(T).GetProperties(System.Reflection.BindingFlags.Public | System.Reflection.BindingFlags.Instance);
            foreach (T t in list)
            {
                if (t == null)
                {
                    continue;
                }
                row = dt.NewRow();
                for (int i = 0, j = myPropertyInfo.Length; i < j; i++)
                {
                    System.Reflection.PropertyInfo pi = myPropertyInfo[i];
                    string name = pi.Name;



                    if (dt.Columns[name] == null)
                    {
                        var type = pi.PropertyType;
                        if (type.IsGenericType && type.GetGenericTypeDefinition() == typeof(Nullable<>))
                        {
                            type = type.GetGenericArguments()[0];
                        }
                        column = new DataColumn(name, type);
                        dt.Columns.Add(column);
                    }
                    row[name] = pi.GetValue(t, null);
                }
                dt.Rows.Add(row);
            }
            ds.Tables.Add(dt);
            return ds;
        }

    }
}
